The 2026 reactivation of main-belt comet 433P/(248370) 2005 QN173

Hsieh, Henry H., Thirouin, Audrey, McLeod, Madeleine K., Cannon, Richard E., Fitzsimmons, Alan and Usher, Helen 2026. The 2026 reactivation of main-belt comet 433P/(248370) 2005 QN173. Research Notes of the American Astronomical Society 10 (8) , 228. 10.3847/2515-5172/ae954a

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Abstract

We report observations of main-belt comet (MBC) 433P/(248370) 2005 QN173 using Las Cumbres Observatory 1 m telescopes in Australia and South Africa, Faulkes Telescope North, Faulkes Telescope South, the Astrophysical Research Consortium 3.5 m telescope, the New Technology Telescope, the Lowell Discovery Telescope, and Rubin Observatory from UT 2026 March 25 to UT 2026 July 26, where visible comet-like activity was observed from UT 2026 June 10 onwards, marking the object’s third confirmed active apparition. When active in the observations reported here, the object displays a narrow tapered tail up to 20″ long aligned with the antisolar direction. These observations mark 433P’s third confirmed active apparition, reinforcing its identification as a MBC.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Schools > Physics and Astronomy Schools > Physical, Chemical & Environmental Sciences
Additional Information:	Full list of authors: https://doi.org/10.3847/2515-5172/ae954a
Publisher:	IOP Publishing
ISSN:	2515-5172
Date of Acceptance:	1 August 2026
Last Modified:	14 Aug 2026 13:30
URI:	https://orca.cardiff.ac.uk/id/eprint/188999

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